Some more interesting pics

Taken on a clear but crisp September morning…

Originally posted by Bmused55
I’ve read and been told that the 757 is actually certified to land with MTOW, which is why it needs no Fuel Dump facility

Is that true?

In a word, yes. An Overweight Landing Check has to be carried out by engineers, but otherwise, no big deal.

Originally posted by wysiwyg
Fuel dumping is only really necessary for long haul aircraft that in the event of having to return to base immediately after take off have a whopping amount of fuel to shed.

Without fuel dumping available we either burn fuel off in the hold or land overweight if the situation is pressing.

I’ve read and been told that the 757 is actually certified to land with MTOW, which is why it needs no Fuel Dump facility

Is that true?

Originally posted by wysiwyg
The 757 is famed for creating the strongest wake vortices of any commercial aircraft and as such is placed in the ‘Heavy’ category when technically it should be medium..

Wysi,

In London ATC the 757 is in it’s own category…medium/heavy. Also in thsis category is the 707, DC8 and a few others. Can’t remember the others though, it was a long time ago that I was in ATC.:cool:

Fuel dumping is only really necessary for long haul aircraft that in the event of having to return to base immediately after take off have a whopping amount of fuel to shed.

Without fuel dumping available we either burn fuel off in the hold or land overweight if the situation is pressing.

Maybe flying at high AOA, as slow as possible, with engines at full ? Would be a real fun ride for the passengers, and would burs fuel fast in case of need 😀 :rolleyes: 😀

No it doesn’t…and neither does the 757.

“The 737 has no fuel dumping facility”

It would have to have some way of ridding itself of fuel incase of emergency landing

The 757 is famed for creating the strongest wake vortices of any commercial aircraft and as such is placed in the ‘Heavy’ category when technically it should be medium.

Vortices come of all parts of the wing and airframe as well as the wingtips. When flaps are deployed you get quite strong vortices off the ends which are most commonly visible on days with high relative humidity.

The 737 has no fuel dumping facility.

Yes, Wake vortex does come from the wing tips. But I don’t think this is a wake vortex as such. Not in the same sense anyway

If I am not very mistaken it is of the same constitution as the wake vortex on a wing tip: Spanwise airflow on the upper (low pressure) and the lower (high pressure) surfaces mix in a spiralling vortex as consequence of nature trying to equalize the pressure. Static pressure in the vortex is very low which causes a visible condensation (vapour) of humidity in the air when conditions (relative humidity – which does not necessarily mean pouring rain!) are right. So it is indeed a vortex of the same type as that originating from the wing tip; in fact, some aircraft (e.g. the Boeing 757) are reputed to produce flap edge trailing vortices which are so powerful that these alone can cause problems for other aircraft flying into them.

As an educational measure I can highly recommend a couple of hour’s spotting at an airport near the extended centerline of the approach runway as close to the threshold as you can get. Not only can you see these vortices, you can also vividly hear and sometimes feel them a couple of second after an aircraft has passed overhead.

That KLM shot is brilliant! Lots of debris being thrown up by the looks of things.

Steve, I’ve been to Austalia about 10 times the last 4 years, and the weather down there, in my opinion, is as diverse as they come! You don’t need to be envious by any means. Then again, I live in Southern California where the weather IS NOT diverse. It is warm about 8 months of the year, and even in winter time it’s not that cold. I am envious of you Scots, however. Not because of the weather, but because of all the Malt Whisky distilleries. Some day, some day…..

Originally posted by steve rowell
I envy you guys with all those great airports and such diverse weather

You wouldn’t be saying that if you lived here LOL.

Divers weather my arse… nothing but rain. Although up here in scotland we have 30 thousand different types of rain LOL! Lots, little, terrential. Vertical, horizontal, inverted! you name it, we get it :rolleyes:

Originally posted by tenthije
Those kind of vortices don’t only happen on wet days. I shot this on a beautiful day with lots of sun and hardly any cloud in sight!

Click here to open

You can clearly see the vortice follows the flaps perfectly, so the flaps cause it.

Yes, I was aware of that. Seen them a few times on aircraft I was aboard.

I think they just Vortices. no specific name.

Once saw me a vortex eminating from the little Strake that sits on the inside of the 737 Engine Cowlings

Those kind of vortices don’t only happen on wet days. I shot this on a beautiful day with lots of sun and hardly any cloud in sight!

Click here to open

You can clearly see the vortice follows the flaps perfectly, so the flaps cause it.

Originally posted by Mark L
Wow! That KLM one is excellent!

Steve, you probably don’t get it as much down in Oz, but here in the UK most mornings you can get pics like that with vortexes appearing around 400ft

I envy you guys with all those great airports and such diverse weather

Wow! That KLM one is excellent!

Steve, you probably don’t get it as much down in Oz, but here in the UK most mornings you can get pics like that with vortexes appearing around 400ft

Originally posted by steve rowell
Doesn’t the wake vortex come from the tip of the wing

Yes, Wake vortex does come from the wing tips. But I don’t think this is a wake vortex as such. Not in the same sense anyway

Anyone got a better answer?

I stand to be corrected

Originally posted by Bmused55
Thats just a wing vortex created by the aerodynamic forces on the wings

Doesn’t the wake vortex come from the tip of the wing

Originally posted by steve rowell
THAI AIRWAYS 737-4D7 HS-TDF whats that vapor coming out, by the position of the flaps and the aircrafts proximity to the ground it looks like it’s on short finals, so he woudn’t be dumping fuel would he

Thats just a wing vortex created by the aerodynamic forces on the wings. Its visable mosy likely because the air was damp. Had it rained in that area recently? (I’m talking hours not days)